Abstract
Zirconia supported iron catalysts promoted with La 2O 3 and CeO 2, respectively, are prepared by sequential impregnation method. It is shown that the structure, reduction behavior, and the catalytic property for CO hydrogenation of these catalysts are quite different from that of the unpromoted Fe/ZrO 2 sample, and are influenced significantly by the kinds of promoter elements. For the Fe/La/ZrO 2 sample, the catalytic activity is only a little bit higher than that of the Fe/ZrO 2 sample, but light olefins selectivity increases and methane formation is suppressed. For the Fe/Ce/ZrO 2 sample, the catalytic activity is much higher than that of the unpromoted Fe/ZrO 2 sample, while methane formation is suppressed and light olefins selectivity slightly increases. The roles of different rare earth oxide promoters in these catalysts are discussed.
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